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| <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>IoTDB用户手册 (V0.12.x)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>IoTDB简介</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>快速上手</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>数据模式与概念</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>SQL命令行终端(CLI)</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>权限管理</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>IoTDB-SQL 语言</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>应用编程接口</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>用户定义函数(UDF)</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>通信服务协议</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>系统工具</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>端云协同</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>系统集成</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>集群搭建</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>常见问题</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>附录</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/zh/UserGuide/V0.12.x/Appendix/Config-Manual.html" aria-current="page" class="active sidebar-link">附录1: 配置参数</a></li><li><a href="/zh/UserGuide/V0.12.x/Appendix/SQL-Reference.html" class="sidebar-link">附录2: SQL 参考文档</a></li><li><a href="/zh/UserGuide/V0.12.x/Appendix/Status-Codes.html" class="sidebar-link">附录3: 状态码</a></li></ul></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="附录1-配置参数"><a href="#附录1-配置参数" class="header-anchor">#</a> 附录1：配置参数</h1> <p>为方便IoTDB Server的配置与管理，IoTDB Server为用户提供三种配置项，使得用户可以在启动服务或服务运行时对其进行配置。</p> <p>三种配置项的配置文件均位于IoTDB安装目录：<code>$IOTDB_HOME/conf</code>文件夹下,其中涉及server配置的共有2个文件，分别为：<code>iotdb-env.sh</code>, <code>iotdb-engine.properties</code>。用户可以通过更改其中的配置项对系统运行的相关配置项进行配置。</p> <p>配置文件的说明如下：</p> <ul><li><p><code>iotdb-env.sh</code>：环境配置项的默认配置文件。用户可以在文件中配置JAVA-JVM的相关系统配置项。</p></li> <li><p><code>iotdb-engine.properties</code>：IoTDB引擎层系统配置项的默认配置文件。用户可以在文件中配置IoTDB引擎运行时的相关参数，如JDBC服务监听端口(<code>rpc_port</code>)、overflow数据文件存储目录(<code>overflow_data_dir</code>)等。此外，用户可以在文件中配置IoTDB存储时TsFile文件的相关信息，如每次将内存中的数据写入到磁盘时的数据大小(<code>group_size_in_byte</code>)，内存中每个列打一次包的大小(<code>page_size_in_byte</code>)等。</p></li></ul> <h2 id="热修改配置项"><a href="#热修改配置项" class="header-anchor">#</a> 热修改配置项</h2> <p>为方便用户使用，IoTDB Server为用户提供了热修改功能，即在系统运行过程中修改<code>iotdb-engine.properties</code>中部分配置参数并即时应用到系统中。下面介绍的参数中，改后 |
| 生效方式为<code>触发生效</code>的均为支持热修改的配置参数。</p> <p>触发方式：客户端发送<code>load configuration</code>命令至IoTDB Server，客户端的使用方式详见第4章</p> <h2 id="环境配置项"><a href="#环境配置项" class="header-anchor">#</a> 环境配置项</h2> <p>环境配置项主要用于对IoTDB Server运行的Java环境相关参数进行配置，如JVM相关配置。IoTDB Server启动时，此部分配置会被传给JVM。用户可以通过查看 <code>iotdb-env.sh</code>(或<code>iotdb-env.bat</code>)文件查看环境配置项内容。详细配置项说明如下：</p> <ul><li>JMX_LOCAL</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">JMX_LOCAL</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">JMX监控模式，配置为yes表示仅允许本地监控，设置为no的时候表示允许远程监控</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">枚举String : “yes”, “no”</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">yes</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>JMX_PORT</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">JMX_PORT</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">JMX监听端口。请确认该端口不是系统保留端口并且未被占用。</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Short Int: [0,65535]</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">31999</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>MAX_HEAP_SIZE</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">MAX_HEAP_SIZE</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">IoTDB启动时能使用的最大堆内存大小。</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">String</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">取决于操作系统和机器配置。在Linux或MacOS系统下默认为机器内存的四分之一。在Windows系统下，32位系统的默认值是512M，64位系统默认值是2G。</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>HEAP_NEWSIZE</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">HEAP_NEWSIZE</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">IoTDB启动时能使用的最小堆内存大小。</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">String</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">取决于操作系统和机器配置。在Linux或MacOS系统下默认值为机器CPU核数乘以100M的值与MAX_HEAP_SIZE四分之一这二者的最小值。在Windows系统下，32位系统的默认值是512M，64位系统默认值是2G。。</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <h2 id="系统配置项"><a href="#系统配置项" class="header-anchor">#</a> 系统配置项</h2> <p>系统配置项是IoTDB Server运行的核心配置，它主要用于设置IoTDB Server文件层和引擎层的参数，便于用户根据自身需求调整Server的相关配置，以达到较好的性能表现。系统配置项可分为两大模块：文件层配置项和引擎层配置项。用户可以通过<code>iotdb-engine.properties</code>,文件查看和修改两种配置项的内容。在0.7.0版本中字符串类型的配置项大小写敏感。</p> <h3 id="文件层配置"><a href="#文件层配置" class="header-anchor">#</a> 文件层配置</h3> <ul><li>compressor</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">compressor</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">数据压缩方法</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">枚举String : “UNCOMPRESSED”, “SNAPPY”, “LZ4”</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">SNAPPY</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">触发生效</td></tr></tbody></table> <ul><li>group_size_in_byte</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">group_size_in_byte</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">每次将内存中的数据写入到磁盘时的最大写入字节数</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Int32</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">134217728</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">触发生效</td></tr></tbody></table> <ul><li>max_number_of_points_in_page</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">max_number_of_points_in_page</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">一个页中最多包含的数据点（时间戳-值的二元组）数量</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Int32</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">1048576</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">触发生效</td></tr></tbody></table> <ul><li>max_degree_of_index_node</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">max_degree_of_index_node</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">元数据索引树的最大度（即每个节点的最大子节点个数）</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Int32</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">256</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">仅允许在第一次启动服务前修改</td></tr></tbody></table> <ul><li>max_string_length</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">max_string_length</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">针对字符串类型的数据，单个字符串最大长度，单位为字符</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Int32</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">128</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">触发生效</td></tr></tbody></table> <ul><li>page_size_in_byte</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">page_size_in_byte</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">内存中每个列写出时，写成的单页最大的大小，单位为字节</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Int32</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">65536</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">触发生效</td></tr></tbody></table> <ul><li>time_series_data_type</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">time_series_data_type</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">时间戳数据类型</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">枚举String: "INT32", "INT64"</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">Int64</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">触发生效</td></tr></tbody></table> <ul><li>time_encoder</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">time_encoder</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">时间列编码方式</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">枚举String: “TS_2DIFF”,“PLAIN”,“RLE”</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">TS_2DIFF</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">触发生效</td></tr></tbody></table> <ul><li>value_encoder</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">value_encoder</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">value列编码方式</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">枚举String: “TS_2DIFF”,“PLAIN”,“RLE”</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">PLAIN</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">触发生效</td></tr></tbody></table> <ul><li>float_precision</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">float_precision</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">浮点数精度，为小数点后数字的位数</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Int32</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">默认为2位。注意：32位浮点数的十进制精度为7位，64位浮点数的十进制精度为15位。如果设置超过机器精度将没有实际意义。</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">触发生效</td></tr></tbody></table> <h3 id="引擎层配置"><a href="#引擎层配置" class="header-anchor">#</a> 引擎层配置</h3> <ul><li>data_dirs</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">data_dirs</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">IoTDB数据存储路径，默认存放在和sbin目录同级的data目录下。相对路径的起始目录与操作系统相关，建议使用绝对路径。</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">String</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">data/data</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">触发生效</td></tr></tbody></table> <ul><li>system_dirs</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">system_dirs</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">IoTDB元数据存储路径，默认存放在和sbin目录同级的data目录下。相对路径的起始目录与操作系统相关，建议使用绝对路径。</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">String</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">data/system</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">触发生效</td></tr></tbody></table> <ul><li>wal_dirs</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">wal_dirs</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">IoTDB写前日志存储路径，默认存放在和sbin目录同级的data目录下。相对路径的起始目录与操作系统相关，建议使用绝对路径。</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">String</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">data/wal</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">触发生效</td></tr></tbody></table> <ul><li>enable_wal</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">enable_wal</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">是否开启写前日志，默认值为true表示开启，配置成false表示关闭</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Bool</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">true</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">触发生效</td></tr></tbody></table> <ul><li>enable_discard_out_of_order_data</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">enable_discard_out_of_order_data</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">是否删除无序数据，默认值为false表示关闭</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Bool</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">false</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">触发生效</td></tr></tbody></table> <ul><li>tag_attribute_total_size</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">tag_attribute_total_size</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">每个时间序列标签和属性的最大持久化字节数</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Int32</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">700</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">仅允许在第一次启动服务前修改</td></tr></tbody></table> <ul><li>enable_partial_insert</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">enable_partial_insert</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">在一次insert请求中，如果部分测点写入失败，是否继续写入其他测点</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Bool</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">true</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>mtree_snapshot_interval</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">mtree_snapshot_interval</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">创建 MTree snapshot 时至少累积的 mlog 日志行数。单位为日志行数</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Int32</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">100000</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>mlog_buffer_size</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">mlog_buffer_size</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">mlog的buffer大小</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Int32</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">1048576</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">触发生效</td></tr></tbody></table> <ul><li>force_wal_period_in_ms</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">force_wal_period_in_ms</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">写前日志定期刷新到磁盘的周期，单位毫秒，有可能丢失至多force_wal_period_in_ms毫秒的操作。</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Int32</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">100</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">触发生效</td></tr></tbody></table> <ul><li>flush_wal_threshold</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">flush_wal_threshold</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">写前日志的条数达到该值之后，刷新到磁盘，有可能丢失至多flush_wal_threshold个操作</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Int32</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">10000</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">触发生效</td></tr></tbody></table> <ul><li>wal_buffer_size</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">wal_buffer_size</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">写前日志的buffer大小</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Int32</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">16777216</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">触发生效</td></tr></tbody></table> <ul><li>enable_mem_control</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">enable_mem_control</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">开启内存控制，避免爆内存</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Bool</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">true</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>memtable_size_threshold</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">memtable_size_threshold</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">内存缓冲区 memtable 阈值</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Long</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">1073741824</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">enable_mem_control为false时生效、重启服务生效</td></tr></tbody></table> <ul><li>avg_series_point_number_threshold</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">avg_series_point_number_threshold</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">内存中平均每个时间序列点数最大值，达到触发flush</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Int32</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">10000</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>tsfile_size_threshold</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">tsfile_size_threshold</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">每个 tsfile 大小</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Long</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">1</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>enable_partition</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">enable_partition</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">是否开启将数据按时间分区存储的功能，如果关闭，所有数据都属于分区 0</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Bool</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">false</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">仅允许在第一次启动服务前修改</td></tr></tbody></table> <ul><li>partition_interval</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">partition_interval</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">用于存储组分区的时间段长度，用户指定的存储组下会使用该时间段进行分区，单位：秒</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Int64</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">604800</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">仅允许在第一次启动服务前修改</td></tr></tbody></table> <ul><li>multi_dir_strategy</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">multi_dir_strategy</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">IoTDB在tsfile_dir中为TsFile选择目录时采用的策略。可使用简单类名或类名全称。系统提供以下三种策略：<br>1. SequenceStrategy：IoTDB按顺序从tsfile_dir中选择目录，依次遍历tsfile_dir中的所有目录，并不断轮循；<br>2. MaxDiskUsableSpaceFirstStrategy：IoTDB优先选择tsfile_dir中对应磁盘空余空间最大的目录；<br>3. MinFolderOccupiedSpaceFirstStrategy：IoTDB优先选择tsfile_dir中已使用空间最小的目录；<br>4. UserDfineStrategyPackage（用户自定义策略）<br>您可以通过以下方法完成用户自定义策略：<br>1. 继承cn.edu.tsinghua.iotdb.conf.directories.strategy.DirectoryStrategy类并实现自身的Strategy方法；<br>2. 将实现的类的完整类名（包名加类名，UserDfineStrategyPackage）填写到该配置项；<br>3. 将该类jar包添加到工程中。</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">String</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">MaxDiskUsableSpaceFirstStrategy</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">触发生效</td></tr></tbody></table> <ul><li>rpc_address</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">rpc_address</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;"></td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">String</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">"0.0.0.0"</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>rpc_port</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">rpc_port</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">jdbc服务监听端口。请确认该端口不是系统保留端口并且未被占用。</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Short Int : [0,65535]</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">6667</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>rpc_max_concurrent_client_num</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">rpc_max_concurrent_client_num</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">最大连接数。</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Short Int : [0,65535]</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">65535</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>rpc_thrift_compression_enable</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">rpc_thrift_compression_enable</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">是否启用thrift的压缩机制。</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">true 或者 false</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">false</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>rpc_advanced_compression_enable</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">rpc_advanced_compression_enable</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">是否启用thrift的自定制压缩机制。</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">true 或者 false</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">false</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>enable_stat_monitor</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">enable_stat_monitor</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">选择是否启动后台统计功能</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Boolean</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">false</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>concurrent_flush_thread</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">concurrent_flush_thread</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">当IoTDB将内存中的数据写入磁盘时，最多启动多少个线程来执行该操作。如果该值小于等于0，那么采用机器所安装的CPU核的数量。默认值为0。</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Int32</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">0</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>tsfile_storage_fs</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">tsfile_storage_fs</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">Tsfile和相关数据文件的存储文件系统。目前支持LOCAL（本地文件系统）和HDFS两种</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">String</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">LOCAL</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">仅允许在第一次启动服务前修改</td></tr></tbody></table> <ul><li>core_site_path</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">core_site_path</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">在Tsfile和相关数据文件存储到HDFS的情况下用于配置core-site.xml的绝对路径</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">String</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">/etc/hadoop/conf/core-site.xml</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>hdfs_site_path</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">hdfs_site_path</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">在Tsfile和相关数据文件存储到HDFS的情况下用于配置hdfs-site.xml的绝对路径</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">String</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">/etc/hadoop/conf/hdfs-site.xml</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>hdfs_ip</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">hdfs_ip</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">在Tsfile和相关数据文件存储到HDFS的情况下用于配置HDFS的IP。<strong>如果配置了多于1个hdfs_ip，则表明启用了Hadoop HA</strong></td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">String</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">localhost</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>hdfs_port</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">hdfs_port</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">在Tsfile和相关数据文件存储到HDFS的情况下用于配置HDFS的端口</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">String</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">9000</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>dfs_nameservices</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">hdfs_nameservices</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">在使用Hadoop HA的情况下用于配置HDFS的nameservices</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">String</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">hdfsnamespace</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>dfs_ha_namenodes</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">hdfs_ha_namenodes</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">在使用Hadoop HA的情况下用于配置HDFS的nameservices下的namenodes</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">String</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">nn1,nn2</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>dfs_ha_automatic_failover_enabled</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">dfs_ha_automatic_failover_enabled</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">在使用Hadoop HA的情况下用于配置是否使用失败自动切换</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Boolean</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">true</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>dfs_client_failover_proxy_provider</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">dfs_client_failover_proxy_provider</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">在使用Hadoop HA且使用失败自动切换的情况下配置失败自动切换的实现方式</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">String</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>hdfs_use_kerberos</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">hdfs_use_kerberos</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">是否使用kerberos验证访问hdfs</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">String</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">false</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>kerberos_keytab_file_path</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">kerberos_keytab_file_path</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">kerberos keytab file 的完整路径</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">String</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">/path</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>kerberos_principal</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">kerberos_principal</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">Kerberos 认证原则</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">String</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">your principal</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>authorizer_provider_class</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">authorizer_provider_class</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">权限服务的类名</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">String</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">org.apache.iotdb.db.auth.authorizer.LocalFileAuthorizer</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr> <tr><td style="text-align:center;">其他可选值</td> <td style="text-align:left;">org.apache.iotdb.db.auth.authorizer.OpenIdAuthorizer</td></tr></tbody></table> <ul><li>openID_url</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">openID_url</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">openID 服务器地址 （当OpenIdAuthorizer被启用时必须设定）</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">String （一个http地址）</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">无</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>thrift_max_frame_size</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">thrift_max_frame_size</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">RPC 请求/响应的最大字节数</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">long</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">67108864 (应大于等于 8 * 1024 * 1024)</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>thrift_init_buffer_size</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">thrift_init_buffer_size</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">字节数</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">long</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">1024</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>timestamp_precision</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">timestamp_precision</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">时间戳精度，支持ms、us、ns</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">String</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">ms</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">触发生效</td></tr></tbody></table> <ul><li>default_ttl</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">default_ttl</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">ttl时间，单位ms</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">long</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">36000000</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <h2 id="数据类型自动推断"><a href="#数据类型自动推断" class="header-anchor">#</a> 数据类型自动推断</h2> <ul><li>enable_auto_create_schema</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">enable_auto_create_schema</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">当写入的序列不存在时，是否自动创建序列到Schema</td></tr> <tr><td style="text-align:center;">取值</td> <td style="text-align:left;">true or false</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">true</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>default_storage_group_level</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">default_storage_group_level</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">当写入的数据不存在且自动创建序列时，若需要创建相应的存储组，将序列路径的哪一层当做存储组. 例如, 如果我们接到一个新序列 root.sg0.d1.s2, 并且level=1， 那么root.sg0被视为存储组（因为root是level 0 层）</td></tr> <tr><td style="text-align:center;">取值</td> <td style="text-align:left;">整数</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">1</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>boolean_string_infer_type</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">boolean_string_infer_type</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">"true" 或者 "false" 被视为什么数据</td></tr> <tr><td style="text-align:center;">取值</td> <td style="text-align:left;">BOOLEAN 或者 TEXT</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">BOOLEAN</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>integer_string_infer_type</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">integer_string_infer_type</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">整数型数据被推断成什么</td></tr> <tr><td style="text-align:center;">取值</td> <td style="text-align:left;">INT32, INT64, FLOAT, DOUBLE, TEXT</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">FLOAT</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>nan_string_infer_type</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">nan_string_infer_type</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">NaN 字符串被推断为什么</td></tr> <tr><td style="text-align:center;">取值</td> <td style="text-align:left;">DOUBLE, FLOAT or TEXT</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">DOUBLE</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>floating_string_infer_type</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">floating_string_infer_type</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">"6.7"等浮点数被推断为什么</td></tr> <tr><td style="text-align:center;">取值</td> <td style="text-align:left;">DOUBLE, FLOAT or TEXT</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">FLOAT</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>long_string_infer_type</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">long_string_infer_type</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">long（num > 2 ^ 24）被推断为什么</td></tr> <tr><td style="text-align:center;">取值</td> <td style="text-align:left;">DOUBLE, FLOAT or TEXT</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">DOUBLE</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>default_boolean_encoding</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">default_boolean_encoding</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">BOOLEAN类型编码格式</td></tr> <tr><td style="text-align:center;">取值</td> <td style="text-align:left;">PLAIN, RLE</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">RLE</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>default_int32_encoding</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">default_int32_encoding</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">int32类型编码格式</td></tr> <tr><td style="text-align:center;">取值</td> <td style="text-align:left;">PLAIN, RLE, TS_2DIFF, REGULAR, GORILLA</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">RLE</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>default_int64_encoding</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">default_int64_encoding</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">int64类型编码格式</td></tr> <tr><td style="text-align:center;">取值</td> <td style="text-align:left;">PLAIN, RLE, TS_2DIFF, REGULAR, GORILLA</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">RLE</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>default_float_encoding</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">default_float_encoding</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">float类型编码格式</td></tr> <tr><td style="text-align:center;">取值</td> <td style="text-align:left;">PLAIN, RLE, TS_2DIFF, GORILLA</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">GORILLA</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>default_double_encoding</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">default_double_encoding</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">double类型编码格式</td></tr> <tr><td style="text-align:center;">取值</td> <td style="text-align:left;">PLAIN, RLE, TS_2DIFF, GORILLA</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">GORILLA</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <ul><li>default_text_encoding</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">default_text_encoding</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">text类型编码格式</td></tr> <tr><td style="text-align:center;">取值</td> <td style="text-align:left;">PLAIN</td></tr> <tr><td style="text-align:center;">默认值</td> <td style="text-align:left;">PLAIN</td></tr> <tr><td style="text-align:center;">改后生效方式</td> <td style="text-align:left;">重启服务生效</td></tr></tbody></table> <h2 id="开启gc日志"><a href="#开启gc日志" class="header-anchor">#</a> 开启GC日志</h2> <p>GC日志默认是关闭的。为了性能调优，用户可能会需要收集GC信息。 |
| 若要打开GC日志，则需要在启动IoTDB Server的时候加上"printgc"参数：</p> <div class="language-bash line-numbers-mode"><pre class="language-bash"><code><span class="token function">nohup</span> sbin/start-server.sh printgc <span class="token operator">></span>/dev/null <span class="token operator"><span class="token file-descriptor important">2</span>></span><span class="token file-descriptor important">&1</span> <span class="token operator">&</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>或者</p> <div class="language-bash line-numbers-mode"><pre class="language-bash"><code>sbin<span class="token punctuation">\</span>start-server.bat printgc |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>GC日志会被存储在<code>IOTDB_HOME/logs/gc.log</code>. 至多会存储10个gc.log文件，每个文件最多10MB。</p></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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